! !NOTE: the section numbers refer to the Metadata Guidelines document. ! ! Section 4.1: Originator Attributes ! ---------------------------------- ! PI_NAME=De Maziere; Martine PI_AFFILIATION=Belgian Institute for Space Aeronomy; BIRA.IASB PI_ADDRESS=Ringlaan, 3; B-1180 Brussels; Belgium PI_EMAIL=martine@bira-iasb.oma.be ! DO_NAME=Vigouroux; Corinne DO_AFFILIATION=Belgian Institute for Space Aeronomy; BIRA.IASB DO_ADDRESS=Ringlaan 3; B-1180 Brussels; Belgium DO_EMAIL=corinnev@bira-iasb.oma.be ! DS_NAME=De Maziere; Martine DS_AFFILIATION=Belgian Institute for Space Aeronomy; BIRA.IASB DS_ADDRESS=Ringlaan, 3; B-1180 Brussels; Belgium DS_EMAIL=martine@bira-iasb.oma.be ! ! Section 4.2: Dataset Attributes ! ------------------------------- ! DATA_DESCRIPTION=FTIR vmr vertical profile data of CH4 at Reunion Island (St Denis), instrument Bruker125HR DATA_DISCIPLINE=ATMOSPHERIC.CHEMISTRY;REMOTE.SENSING;GROUNDBASED DATA_GROUP=EXPERIMENTAL;PROFILE.STATIONARY DATA_LOCATION=LA.REUNION DATA_SOURCE=FTIR.CH4_BIRA.IASB002 ! DATA_VARIABLES=DATETIME; LATITUDE.INSTRUMENT;LONGITUDE.INSTRUMENT;ALTITUDE.INSTRUMENT;SURFACE.PRESSURE_INDEPENDENT;SURFACE.TEMPERATURE_INDEPENDENT;ALTITUDE;ALTITUDE.BOUNDARIES;PRESSURE_INDEPENDENT;TEMPERATURE_INDEPENDENT;CH4.MIXING.RATIO_ABSORPTION.SOLAR;CH4.MIXING.RATIO_ABSORPTION.SOLAR_APRIORI;CH4.MIXING.RATIO_ABSORPTION.SOLAR_AVK;INTEGRATION.TIME;CH4.MIXING.RATIO_ABSORPTION.SOLAR_UNCERTAINTY.RANDOM;CH4.MIXING.RATIO_ABSORPTION.SOLAR_UNCERTAINTY.SYSTEMATIC;CH4.COLUMN.PARTIAL_ABSORPTION.SOLAR;CH4.COLUMN.PARTIAL_ABSORPTION.SOLAR_APRIORI;CH4.COLUMN_ABSORPTION.SOLAR;CH4.COLUMN_ABSORPTION.SOLAR_APRIORI;CH4.COLUMN_ABSORPTION.SOLAR_AVK;CH4.COLUMN_ABSORPTION.SOLAR_UNCERTAINTY.RANDOM;CH4.COLUMN_ABSORPTION.SOLAR_UNCERTAINTY.SYSTEMATIC;ANGLE.SOLAR_ZENITH.ASTRONOMICAL;ANGLE.SOLAR_AZIMUTH;H2O.MIXING.RATIO_ABSORPTION.SOLAR;H2O.COLUMN_ABSORPTION.SOLAR ! DATA_START_DATE= DATA_STOP_DATE= DATA_FILE_VERSION=001 DATA_MODIFICATIONS=None DATA_QUALITY=This data is intended for validation purposes DATA_CAVEATS=None DATA_RULES_OF_USE=please contact M. De Maziere DATA_ACKNOWLEDGEMENT=The data are provided by the Belgian Institute for Space Aeronomy, and have been acquired with national, ESA and EU funding (project NORS) ! ! ! Section 4.3: File Attributes ! ---------------------------- ! FILE_NAME= FILE_GENERATION_DATE=4507.500000 FILE_ACCESS=HYMN;NDACC FILE_PROJECT_ID=AOID9999 FILE_ASSOCIATION=NDACC;NORS FILE_META_VERSION=04R004;IDLCR8HDF ! ! Section 5.1 & 5.2: Variable Attributes ! -------------------------------------- ! VAR_NAME=DATETIME VAR_DESCRIPTION=datetime (UT), defined relative to reference datetime of Jan. 1, 2000 at 0:00:00 UT which is equal to 0.00 VAR_NOTES= VAR_DATA_TYPE=DOUBLE VAR_SIZE=7 VAR_DEPEND=DATETIME VAR_UNITS=MJD2K VAR_SI_CONVERSION=0;86400;s VAR_VALID_MIN=-5500 VAR_VALID_MAX=4498 VAR_FILL_VALUE=-90000.000000000 ! ! VAR_NAME=LATITUDE.INSTRUMENT VAR_DESCRIPTION=latitude north (decimal degrees) of the location of the instrument VAR_NOTES= VAR_DATA_TYPE=REAL VAR_SIZE=1 VAR_DEPEND=CONSTANT VAR_UNITS=deg VAR_SI_CONVERSION=0;0.017453292519943;rad VAR_VALID_MIN=-90 VAR_VALID_MAX=90 VAR_FILL_VALUE=-90000.00 ! ! VAR_NAME=LONGITUDE.INSTRUMENT VAR_DESCRIPTION=longitude east (decimal degrees) of the location of the instrument VAR_NOTES= VAR_DATA_TYPE=REAL VAR_SIZE=1 VAR_DEPEND=CONSTANT VAR_UNITS=deg VAR_SI_CONVERSION=0;0.017453292519943;rad VAR_VALID_MIN=-180 VAR_VALID_MAX=180 VAR_FILL_VALUE=-90000.00 ! ! VAR_NAME=ALTITUDE.INSTRUMENT VAR_DESCRIPTION=altitude of the location of the instrument VAR_NOTES= VAR_DATA_TYPE=REAL VAR_SIZE=1 VAR_DEPEND=CONSTANT VAR_UNITS=km VAR_SI_CONVERSION=0;1000;m VAR_VALID_MIN=-0.05 VAR_VALID_MAX=10 VAR_FILL_VALUE=-90000.000 ! ! VAR_NAME=SURFACE.PRESSURE_INDEPENDENT VAR_DESCRIPTION=surface pressure measured at the observation site VAR_NOTES= VAR_DATA_TYPE=REAL VAR_SIZE=7 VAR_DEPEND=DATETIME VAR_UNITS=hPa VAR_SI_CONVERSION=0;100;m-1 kg s-2 VAR_VALID_MIN=0 VAR_VALID_MAX=1100 VAR_FILL_VALUE=-9.0000E+004 ! ! VAR_NAME=SURFACE.TEMPERATURE_INDEPENDENT VAR_DESCRIPTION=temperature at ground level, measured at the observation site VAR_NOTES= VAR_DATA_TYPE=REAL VAR_SIZE=7 VAR_DEPEND=DATETIME VAR_UNITS=K VAR_SI_CONVERSION=0;1;K VAR_VALID_MIN=0 VAR_VALID_MAX=500 VAR_FILL_VALUE=-90000.000 ! ! VAR_NAME=ALTITUDE VAR_DESCRIPTION=Grid of altitude levels upon which the retrieved target vmr profile as well as pressure and temperature profiles are reported VAR_NOTES= these altitudes are the centers of the retrieval altitude layers (geometric mean between the 2 layer boundaries); the reported vmr, P and T are effective layer values. VAR_DATA_TYPE=REAL VAR_SIZE=47 VAR_DEPEND=ALTITUDE VAR_UNITS=km VAR_SI_CONVERSION=0;1000;m VAR_VALID_MIN=0 VAR_VALID_MAX=120 VAR_FILL_VALUE=-90000.000 ! ! VAR_NAME=ALTITUDE.BOUNDARIES VAR_DESCRIPTION= 2D matrix providing the layer boundaries used for vertical profile retrieval VAR_NOTES= The retrieved partial columns are given between the boundaries provided in this vector. The lowermost boundary is equal to ALTITUDE.INSTRUMENT. VAR_DATA_TYPE=REAL VAR_SIZE=47;2 VAR_DEPEND=ALTITUDE;INDEPENDENT VAR_UNITS=km VAR_SI_CONVERSION=0;1000;m VAR_VALID_MIN=0 VAR_VALID_MAX=150 VAR_FILL_VALUE=-90000.000 ! ! VAR_NAME=PRESSURE_INDEPENDENT VAR_DESCRIPTION= Total effective air pressures in layers for vertical profile retrieval VAR_NOTES=Pressure/temperature profiles are taken from NCEP; the pressure values represent the effective pressure in each layer and are reported at the center altitude of each layer VAR_DATA_TYPE=REAL VAR_SIZE=47;7 VAR_DEPEND=ALTITUDE;DATETIME VAR_UNITS=hPa VAR_SI_CONVERSION=0;100;m-1 kg s-2 VAR_VALID_MIN=0 VAR_VALID_MAX=1100 VAR_FILL_VALUE=-9.0000E+004 ! ! VAR_NAME=TEMPERATURE_INDEPENDENT VAR_DESCRIPTION=effective air temperatures in layers for vertical profile retrieval VAR_NOTES=Pressure/temperature profiles are taken from NCEP; the temperature values represent the effective temperatures in each layer and are reported at the center altitude of each layer VAR_DATA_TYPE=REAL VAR_SIZE=47;7 VAR_DEPEND=ALTITUDE;DATETIME VAR_UNITS=K VAR_SI_CONVERSION=0;1;K VAR_VALID_MIN=0 VAR_VALID_MAX=500 VAR_FILL_VALUE=-90000.000 ! ! VAR_NAME=CH4.MIXING.RATIO_ABSORPTION.SOLAR VAR_DESCRIPTION= retrieved vertical profile of CH4 from solar absorption measurements, in VMR units VAR_NOTES= retrieval algorithm sfit2; UFTIR retrieval strategy ( see http://www.nilu.no/uftir); HITRAN2004 spectroscopy VAR_DATA_TYPE=REAL VAR_SIZE=47;7 VAR_DEPEND=ALTITUDE;DATETIME VAR_UNITS=ppmv VAR_SI_CONVERSION=0;1E-6;1 VAR_VALID_MIN=-1 VAR_VALID_MAX=10 VAR_FILL_VALUE=-9.0000E+004 ! ! VAR_NAME=CH4.MIXING.RATIO_ABSORPTION.SOLAR_APRIORI VAR_DESCRIPTION=a priori vertical profile of CH4 used in the retrieval (OEM-SFIT2), in VMR units VAR_NOTES= the same a priorti vertical profile was taken for all days in the present datafile VAR_DATA_TYPE=REAL VAR_SIZE=47;7 VAR_DEPEND=ALTITUDE; DATETIME VAR_UNITS=ppmv VAR_SI_CONVERSION=0;1E-6;1 VAR_VALID_MIN=0 VAR_VALID_MAX=10 VAR_FILL_VALUE=-9.0000E+004 ! ! VAR_NAME=CH4.MIXING.RATIO_ABSORPTION.SOLAR_AVK VAR_DESCRIPTION= averaging kernel matrix (AVK) of the retrieved vertical profile of CH4, in VMR/VMR units VAR_NOTES=dimension 1 are the AVK rows; dimension 2 are the AVK columns VAR_DATA_TYPE=REAL VAR_SIZE=47;47;7 VAR_DEPEND=ALTITUDE;ALTITUDE;DATETIME VAR_UNITS=1 VAR_SI_CONVERSION=0;1;1 VAR_VALID_MIN=-2. VAR_VALID_MAX=2. VAR_FILL_VALUE=-9.0000E+004 ! ! VAR_NAME=INTEGRATION.TIME VAR_DESCRIPTION= duration of the measurement of the interferogram (and thus spectrum) from which the profile has been retrieved VAR_NOTES= the duration increases with the spectral resolution of the measurement VAR_DATA_TYPE=REAL VAR_SIZE=7 VAR_DEPEND=DATETIME VAR_UNITS=s VAR_SI_CONVERSION=0;1;s VAR_VALID_MIN=0 VAR_VALID_MAX=21600 VAR_FILL_VALUE=-9.0000E+004 ! ! VAR_NAME=CH4.MIXING.RATIO_ABSORPTION.SOLAR_UNCERTAINTY.RANDOM VAR_DESCRIPTION= total random error covariance matrix associated with the retrieved vertical profiles of CH4, in VMR units VAR_NOTES=This error covariance matrix includes the contributions from the measurement error and the model parameters random errors, not the smoothing error. VAR_DATA_TYPE=REAL VAR_SIZE=47;47;7 VAR_DEPEND=ALTITUDE;ALTITUDE;DATETIME VAR_UNITS=ppmv2 VAR_SI_CONVERSION=0;1E-12;1 VAR_VALID_MIN=-2 VAR_VALID_MAX=2 VAR_FILL_VALUE=-9.0000E+004 ! ! VAR_NAME=CH4.MIXING.RATIO_ABSORPTION.SOLAR_UNCERTAINTY.SYSTEMATIC VAR_DESCRIPTION= total systematic error covariance matrix associated with the retrieved vertical profiles of CH4, in VMR units VAR_NOTES=The error covariance matrix includes the contributions from the spectroscopic errors VAR_DATA_TYPE=REAL VAR_SIZE=47;47;7 VAR_DEPEND=ALTITUDE;ALTITUDE;DATETIME VAR_UNITS=ppmv2 VAR_SI_CONVERSION=0;1E-12;1 VAR_VALID_MIN=-2 VAR_VALID_MAX=2 VAR_FILL_VALUE=-9.0000E+004 ! ! VAR_NAME=CH4.COLUMN.PARTIAL_ABSORPTION.SOLAR VAR_DESCRIPTION= retrieved CH4 (vertical) partial columns in the retrieval layers VAR_NOTES= partial column evaluations use a priori pressure and temperature values from NCEP VAR_DATA_TYPE=REAL VAR_SIZE=47;7 VAR_DEPEND=ALTITUDE;DATETIME VAR_UNITS=Pmolec cm-2 VAR_SI_CONVERSION=0;1.660539E-5;mol m-2 VAR_VALID_MIN=0 VAR_VALID_MAX=10000 VAR_FILL_VALUE=-9.0000E+004 ! ! VAR_NAME=CH4.COLUMN.PARTIAL_ABSORPTION.SOLAR_APRIORI VAR_DESCRIPTION= a priori CH4 (vertical) partial columns in the retrieval layers VAR_NOTES= partial column evaluations use a priori pressure and temperature values from NCEP VAR_DATA_TYPE=REAL VAR_SIZE=47;7 VAR_DEPEND=ALTITUDE;DATETIME VAR_UNITS=Pmolec cm-2 VAR_SI_CONVERSION=0;1.660539E-5;molec m-2 VAR_VALID_MIN=0 VAR_VALID_MAX=10000 VAR_FILL_VALUE=-9.0000E+004 ! ! VAR_NAME=CH4.COLUMN_ABSORPTION.SOLAR VAR_DESCRIPTION=retrieved total vertical column of CH4 above St Denis / Ile de La Reunion - corresponding to retrieved vmr profiles VAR_NOTES= VAR_DATA_TYPE=REAL VAR_SIZE=7 VAR_DEPEND=DATETIME VAR_UNITS=Emolec cm-2 VAR_SI_CONVERSION=0;1.660539E-2;mol m-2 VAR_VALID_MIN=0 VAR_VALID_MAX=200 VAR_FILL_VALUE=-9.0000E+004 ! ! VAR_NAME=CH4.COLUMN_ABSORPTION.SOLAR_APRIORI VAR_DESCRIPTION=a priori total vertical column of CH4 above St Denis / Ile de La Reunion - corresponding to a priori vmr profiles VAR_NOTES= VAR_DATA_TYPE=REAL VAR_SIZE=7 VAR_DEPEND=DATETIME VAR_UNITS=Emolec cm-2 VAR_SI_CONVERSION=0;1.660539E-2;mol m-2 VAR_VALID_MIN=0 VAR_VALID_MAX=200 VAR_FILL_VALUE=-9.0000E+004 ! ! VAR_NAME=CH4.COLUMN_ABSORPTION.SOLAR_AVK VAR_DESCRIPTION= total vertical column averaging kernel for CH4 derived from mixing ratio averaging kernel VAR_NOTES= this averaging kernel multiplies the partial column vector in order to get smoothed total column VAR_DATA_TYPE=REAL VAR_SIZE=47;7 VAR_DEPEND=ALTITUDE;DATETIME VAR_UNITS=1 VAR_SI_CONVERSION=0;1;1 VAR_VALID_MIN=-2 VAR_VALID_MAX=3 VAR_FILL_VALUE=-9.0000E+004 ! ! VAR_NAME=CH4.COLUMN_ABSORPTION.SOLAR_UNCERTAINTY.RANDOM VAR_DESCRIPTION=total random uncertainty on the retrieved total vertical columns of CH4 above St Denis / Ile de La Reunion VAR_NOTES=smoothing error is not included! VAR_DATA_TYPE=REAL VAR_SIZE=7 VAR_DEPEND=DATETIME VAR_UNITS=Emolec cm-2 VAR_SI_CONVERSION=0;1.660539E-2;mol m-2 VAR_VALID_MIN=0 VAR_VALID_MAX=200 VAR_FILL_VALUE=-9.0000E+004 ! ! VAR_NAME=CH4.COLUMN_ABSORPTION.SOLAR_UNCERTAINTY.SYSTEMATIC VAR_DESCRIPTION=total systematic uncertainty on the retrieved total vertical columns of CH4 above St Denis / Ile de La Reunion VAR_NOTES= VAR_DATA_TYPE=REAL VAR_SIZE=7 VAR_DEPEND=DATETIME VAR_UNITS=Emolec cm-2 VAR_SI_CONVERSION=0;1.660539E-2;mol m-2 VAR_VALID_MIN=0 VAR_VALID_MAX=200 VAR_FILL_VALUE=-9.0000E+004 ! ! VAR_NAME=ANGLE.SOLAR_ZENITH.ASTRONOMICAL VAR_DESCRIPTION=astronomical zenith angle of the sun VAR_NOTES=in solar absorption mode, the sun defines the line of sight VAR_DATA_TYPE=REAL VAR_SIZE=7 VAR_DEPEND=DATETIME VAR_UNITS=deg VAR_SI_CONVERSION=0;0.017453292519943;rad VAR_VALID_MIN=0 VAR_VALID_MAX=180 VAR_FILL_VALUE=-90000.00 ! ! VAR_NAME=ANGLE.SOLAR_AZIMUTH VAR_DESCRIPTION=azimuth angle of the sun (O at South, pos. to East, neg. to West) VAR_NOTES=in solar absorption mode, the sun defines the line of sight VAR_DATA_TYPE=REAL VAR_SIZE=7 VAR_DEPEND=DATETIME VAR_UNITS=deg VAR_SI_CONVERSION=0;0.017453292519943;rad VAR_VALID_MIN=-180 VAR_VALID_MAX=180 VAR_FILL_VALUE=-90000.00 ! ! VAR_NAME=H2O.MIXING.RATIO_ABSORPTION.SOLAR VAR_DESCRIPTION= vertical profile of the interfering species H2O in the retrieval, in VMR units VAR_NOTES= retrieval algorithm sfit2; UFTIR retrieval strategy ( see http://www.nilu.no/uftir);water vapour column is retrieved together with methane VAR_DATA_TYPE=REAL VAR_SIZE=47;7 VAR_DEPEND=ALTITUDE;DATETIME VAR_UNITS=ppmv VAR_SI_CONVERSION=0;1E-6;1 VAR_VALID_MIN=-1 VAR_VALID_MAX=26177 VAR_FILL_VALUE=-9.0000E+004 ! ! VAR_NAME=H2O.COLUMN_ABSORPTION.SOLAR VAR_DESCRIPTION= total vertical column of the interfering species H2O in the retrieval VAR_NOTES=retrieval algorithm sfit2; UFTIR retrieval strategy ( see http://www.nilu.no/uftir);water vapour column is retrieved together with methane VAR_DATA_TYPE=REAL VAR_SIZE=7 VAR_DEPEND=DATETIME VAR_UNITS=Zmolec cm-2 VAR_SI_CONVERSION=0;1.660539E+1;mol m-2 VAR_VALID_MIN=0 VAR_VALID_MAX=200 VAR_FILL_VALUE=-9.0000E+004 ! !